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/*
* Copyright 2024, Google LLC
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* Neither the name of Google LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.android.tools.smali.util;
import java.lang.Iterable;
import java.util.Iterator;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Combines two iterators into a single iterator. The returned iterator iterates across the elements
* in {@code a}, followed by the elements in {@code b}. The source iterators are not polled until
* necessary.
* <p>
* The returned iterator does not support {@code remove()}.
*/
public class ChainedIterator<T extends @Nullable Object> implements Iterator<T>, Iterable<T> {
Iterator<T> iteratorA;
Iterator<T> iteratorB;
public ChainedIterator(Iterable<T> iterableA, Iterable<T> iterableB) {
this.iteratorA = iterableA.iterator();
this.iteratorB = iterableB.iterator();
}
@Override
public final boolean hasNext() {
return iteratorA.hasNext() || iteratorB.hasNext();
}
@Override
public final T next() {
if (iteratorA.hasNext()) {
return iteratorA.next();
}
return iteratorB.next();
}
@Override
public final void remove() {
throw new UnsupportedOperationException();
}
@Override
public final Iterator<T> iterator() {
return this;
}
}
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